215 



HABITS OF LARVAE 



The only species that I have reared was found feeding in fungi 

 {Agaricus sp. ). The species are recorded as fungivorous. Before 

 pupation the larva forms a glutinous tube which is very compact, 

 and in this the pupa is enclosed. The pupa of immatura was found 

 under a bush in woods near Urbana, the larva having very probably 

 fed upon some fungus there. 



HABITS OF IMAGINES 



The imagines of many species of this genus are found commonly 

 in woods, flying among the low herbage, and are also frequently taken 

 feeding on nectar of various plants. 



Limnobia TRiocELLATA Osten Sacken 

 Limnobia triocellata Osten Sacken, Proc. Acad. Nat. Sci. Phila., 1859, p. 216. 



Larva (PI. XXXIII, Fig. 13).— Length, 18-20 mm. White, 

 semitransparent (alcoholic specimens). Dorsum of head with a 

 large blackish patch on each side. Head as in Figures 16 and 17; 

 mandibles as in Figure 6; antennae of moderate length, distinctly 

 2-jointed. Thoracic segments 2 and 3 each with a large number of 

 transverse series of minute spinules on anterior fifth of dorsal sur- 

 face; first segment with a few microscopic hairs rather longer than 

 the spinules on segments 1 and 2 ; ventral surface of the three seg- 

 ments with very similar armature, that on 2 and 3 the more compact, 

 rather longer, and with the areas occupied by it slightly elevated. 

 Abdominal segments 1-7 each with a narrow transverse stripe of short 

 black spinules on posterior margin, the stripes tapering to a point on 

 each side and not reaching lateral margin except in the case of the 

 one on segment 7, which is broad and connects with a similar band 

 or stripe on ventral surface ; anterior margins of all segments of 

 venter with a transverse swelling which is armed with stiff black 

 spinules similar to but rather longer than those on dorsal surface, these 

 spinules and those of the dorsal series, without magnification, giving 

 the larva the appearance of having 7 narrow black dorsal stripes and 

 10 broader ventral ones ; apical segment with the large rounded 

 spiracles situated in a slight cavity, the margins of which are slightly 

 irregular but not furnished with well-defined tubercles, the spiracles 

 being capable of entire enclosure by the retraction of the central cavity 

 and the infolding of the margin ; apical ventral surface with a pair 

 of short, rounded, retractile blood-gills (Fig. 10). 



